Here are the known issues in Windows 10 Mobile Insider Preview build 14376

Dona’s been enjoying throwing new builds at us at a breakneck pace, and we’re certainly having a good time with it. The big red button found itself pressed again today, deploying build 14376 to the Windows Insider Fast Ring. The build is, as you might imagine, yet another bug-smashing release – that means that insiders are going to be treating Microsoft to a free round of bug testing.

You can open PDFs in Microsoft Edge but won’t be able to use touch to interact with the PDF (such as scrolling, pan or zoom). When you try to use touch to interact with a PDF, it will constantly reload the PDF.

We’ve heard you and we are investigating decreases in battery life on older devices such as the Lumia 830, 930, and 1520.

We’re also investigating Wi-Fi disconnect issues – if you are experiencing an issue with your Wi-Fi disconnecting, please see this forum post and make sure to upvote Wi-Fi disconnecting issues in the Feedback Hub.

We have changed the backup format for Windows 10 Mobile devices to reduce the size of the backup stored in OneDrive. As a result, if you do a backup on a device running the latest Windows 10 Mobile Insider Preview builds and move back to the released version of Windows 10 Mobile (Build 10586) and restore from your backup – your Start screen layout won’t restore and remain the default Start layout. Your previous backup also gets overwritten. If you need to go back to Build 10586 temporarily, once you are on Build 10586 you should disable backup so it doesn’t overwrite the good backup from Windows 10 Mobile Insider Preview builds.

If you run into any of these bugs while you’re testing out build 14376 on your Windows 10 Mobile device, don’t worry about it – Microsoft’s already well aware and are working on fixing it up. If your bug isn’t listed here, however, go ahead and let the team know so that they can polish it out before the next build.